Antioxidizing paraffin composition



Patented July 27, 1943 2,325,085 ANTIOXIDIZING PARAFFIN COWOSITIONHerbert G. Vore, Jackson to American Seal-Kap Corporation of Delaware,

Wilmington,

Heights, N. Y., assignm- Del., a. corporation of Delaware No Drawing.Application February 14, 1941, Serial No. 378,973

9 Claims.

This invention relates to anti-oxidants for paraffin waxes and oils andhas for an object to prevent paraflin compositions from oxidizing,discoloring or developing an objectionable odor.

Another object is to provide an anti-oxidant of the above type havingnovel and improved charmy copending application 326,622, filed March 29,1946, for Anti-oxidizing parafin composition. Although the novelfeatures which are believed to be characteristic of this invention arepointed out more particularly in the claims appended hereto, the natureof the invention will be better understood by referring to the followingdescription in which certain specific embodiments thereof have been setforth for purposes of illustration.

In the following description and in the claims certain specific termshave been used for convenience in referring to various details of theinvention. These terms, however, are to be given as broad aninterpretation as the state of the art will permit.

It has been found that baths of paraffin wax such, for example, as thoseused commercially for water-proofing, sizing or impregnating paper, tendto foul and to cause discoloration or undesirable odors due to oxidationof the paraffin, particularly after long continued use at elevatedtemperatures. I have discovered that certain other substances, even whenpresent in minute quantities in a bath of parafiin waxes or paraflinoils, have the property of preventing such oxidation and permit the bathto be used commercially for long periods of time without fouling.

The invention is particularl applicable to paraffin wax baths to be usedfor impregnating or treating paper for the formation of bottle caps inaccordance with the process set forth in the Baum Patent 1,668,349. Inthat, process it is necessary to maintain a bath of wax at a temperatureof, for example, 235 F. to 240 F. for indefinite periods of time. Asoperated commercially, the bath is maintained continuously at this 66temperature, new wax being added toreplace wax which is used up in theprocess.

In accordance with the present invention, I have found that natural andartificial asphalts and pitches, and their derivatives and asphaltlikesubstances, such as gilsonite, manjak and other asphaltites andpetroleum residue asphalts, in extremely small percentages are suited toprevent oxidation of a paramn wax bath when the bath is operated at theabove temperature. It is to be understood that the percentage ofantioxidant required increases in accordance with the temperature of thebath and at the higher temperatures the increase is much more rapid.

The following table gives certain examples of such anti-oxidants:

Approximate per approximate per cent retqui rgdtto cent riquirgdttopreven on a 1011 preven on a 1011 Ann oxidant mammal in an industrial inan industrial paraflin bath at paraffin bath at 230 F.240 F. F.-2l0 F.

Per cent Per cent Egyptian asphalt .02 .01 Cuban gilsonlte .04 02Petroleum residue asphalt (Ennjay 006 .003 Isthmian asphalt .02 01 anjak02 01 Utah gilsomte 02 .01 Fatty acid pitch 50 25 Cottonseed pitch 10 05Stearine pitch 50 25 It is to be understood that the above examples arerepresentative only and that various other bituminous materials havingsimilar properties maybe used.

In addition to the above named anti-oxidants, it has been found thatabout .6 percent of ceresin breaks down the crystalline structure of theparaffin and tends to make the wax harder and more water resistant. Abath of parafin wax of the type melting between 133 F. and 138 F.;containing about .6 percent ceresin and about .04 percent of petroleumresidue asphalt is particularly suited to the paper treating process setforth in the Baum patent above mentioned. This composition possesses thenecessary hardness and water-resistance to prevent the skirt of the capfrom softening or opening up on the bottle due to absorbed water. Thebath will not oxidize, foul or develop objectionable odors even afterlong continued use at elevated temperatures. Furthermore, in the smallpercentage used the gilsonite or asphalt does not introduce anyobjectionable discoloration.

It is to be understood that the wax baths above mentioned are suitablefor various uses in the paper and allied industries, such as treating,sizing, waterproofing, impregnating, etc., and that the invention is notto be restricted to the particular use above set forth. Various changesand. modifications may be made therein as will be readily apparent to aperson skilled in the art. The invention is only to be limited inaccordance with the scope of the following claims.

What is claimed is:

1. A wax composition for the treatment of paper comprising a paramn waxhaving incorporated therein about .003 to .04 percent of petroleumresidue asphalt.

2. A wax composition for the treatment of paper comprising a paramn waxhaving incorporated therein about .02 to .0 percent of gilsonite.

3. A wax composition for the treatment of paper comprising a parafin waxhaving incorporated therein about .02 to .04 percent of manjak.

4. A wax composition for the treatment of paper comprising a paraflinwax having incorporated therein about .003 to .04 percent of petroleumresidue asphalt and a small percentage of ceresin.

5. The method of preventing oxidation of molten paraffin wax baths andhot p'araflin oil baths which comprises maintaining therein about .003%to .04% of a petroleum residue asphalt.

6. The method of preventing oxidation of molten paraflin wax baths andhot paraflin oil baths which comprises maintaining therein about .02% to.04% of gilsonite.

7. The method of preventing oxidation of molten paraflln wax bath andhot paramn oil baths whichcomprises maintaining therein about .02% to.04% of manjak.

8. A wax composition for the treatment of paper comprising a parafiinwax having incorporated therein about .003% to .5% of an antioxidantbituminous material selected from the group consisting of naturalasphalt, petroleum residue asphalt, gilsonite, manjak, fatty acid pitch,cottonseed pitch and stearine pitch.

9. The method of preventing oxidation of molten paraifin wax baths andhot paraflin oil baths, which comprises maintaining in the baths about.003% to .5% of an anti-oxidant bituminous material selected from thegroup consisting of natural asphalt, petroleum residue asphalt,gilsonite, manjak, fatty acid pitch, cottonseed pitch and stearinepitch.

IERBERT G. VORE.

